exam Maths Puzzle Numerical Ability

please help me in this
let x have the p.d.f f(x)= (x+2)/18 , -2

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How would you do this problem?
2a^2-ab+b^2(a-2b)
I dont know if i should use distribution or foil to do this. Please help Thank you A sales rep for a company estimates that her automobile gasoline consumption averages 28 mpg on highway and 22 mpg in the city. A recent trip covered 627 miles and 24 gallons of ga